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Definition of: ornithischian
(ôr′nə·this′kē·ən) Paleontol. adjective
Belonging to an order (Ornithischia) of birdlike, chiefly amphibious dinosaurs of the Jurassic and Cretaceous periods, including the iguanodon.
—noun A member of this order. [<NL <Gk. ornis, ornithos a bird + ischion a hip]
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